Former Manchester United defender and Sky Sports pundit Gary Neville believes Manchester United will need to make at least 5-6 summer signings to stand any chance of competing next season.
Despite spending over 150m in the summer, Mourinho has seen his side slide down to 5th position in the league and failing to win 2-3 games in a row.
Part of the reason is seen as the average squad strength and Old Trafford and Neville thinks Mourinho needs a massive squad overhaul if he wants to fight for titles next season.
Speaking with Sky Sports, Neville said: “In some ways, when you can easily identify your weaknesses and where you need to strengthen, that’s a good thing. I’m sure that is how Jose will be looking at it.
“At this moment in time too many mistakes have been made and I think Jose will know that. His frustration with his strikers after the game on Saturday was real.
“He’s lining it up, you can see it already. There’s talk of Griezmann coming but he’s lining up for another big summer. It’s not just the attack where he’s short.
“He needs a centre-back and a holding midfield player. He needs five or six to come in and probably two or three will go.”
Fellow Sky Sports analyst Jamie Carragher added: “Zlatan has that personality and presence but I feel it’s a bit embarrassing for those other players that they need a 35-year-old centre-forward.
“It’s a big worry, the fact these young players go in there and can’t seem to cope, it doesn’t bode well for them and I think that’s Mourinho’s frustration.
“When you play at the top level, if you get a chance you must take it.”